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I have generally had v good success with a hand impact wrench and torx bit hammered in..
I’d buy something like this cos it’s only £10(if you have fairly decent access to the screw)
Hilka 11670013 1/2-Inch Pro Craft Impact Driver Set (13-Piece) https://amzn.eu/d/7L16GpN
Some torx bits in the size you need to work with it.
And the propane torch.
Also cutting a slot and trying to tap it anti clockwise with a punch or whatever has worked for me in the past too
Best way to remove a soft bolt fitted with over zealous usage of loctite?
Impact driver or propane torch ? I don't have either so would prefer to buy one or the other.